SKF MTx, Техническое руководство, Страница: 18 / 68

HARDWARE MTx
1 - 6 - 16 SKF Condition Monitoring Centre – Steyr
Condition two for sensor two:
341 333 < 600 000 - condition ok
Fig. 3/13 ... Connection examples
3.2.3. Switching sensor
PNP input
This input option supports all sensors with a switching output such as pressure of fluids,
force, supply voltage inspection, (end) position sensors, ...
The MTx therefore can provide switching voltages up to 24 V.
If the desired sensor is a simple switch the 24 V sensor-supplies can be used of course.
Internal the 24 V input then will be down converted to 3,08 V and then amplified (by one)
for the ADC. For that purpose a voltage divider which divides the input by 7,8 is used. The
ADC can handle a maximum of 3,3 V.
There is a possibility to connect other sensors with a switched voltage-output less than the
24 V. Thereto the gain of the input-amplifier is adjustable (see the example calculation in
voltage (Eddy Probe) input).
Also the switching-level (referring to 24 V) can be adjusted in software where you can also
choose a high- or low-active usage.
Parameters in software
1. Active on:
Defines high- or low-active usage.
2. Switching level:
Defines the threshold-level (referring to 24 V) in %.
3. Gain:
Defines pre-amplification as described in the text above.
512
40000
60
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341333 =